The fruit of a dwarf shrub, Vaccinium Oxycoccos, a native of Britain, Northern Europe, Siberia, and N. America, growing in turfy bogs: a small, roundish, dark red, very acid berry. Also the similar but larger fruit of V. macrocarpon, a native of N. America ( large cranberry or American cranberry). Both are used for tarts, preserves, etc. The name is also given to the shrubs themselves.——牛津当代大辞典

Applied with qualifications to several plants having fruit resembling a cranberry; as   Australian cranberry n. Lissanthe sapida (family Epacridaceæ).  bush cranberry n.,  high cranberry n.,  cranberry tree n. Viburnum Oxycoccos Pursh (family Caprifoliaceæ).  Tasmanian cranberry n. Astroloma humifusum (family Epacridaceæ).——牛津当代大辞典

a small red sour fruit.——朗文当代大辞典  @en